Knight & Castle

Play chess offline against Stockfish and learn from every move. Knight & Castle is a focused chess trainer for players who want a strong opponent, instant move feedback, and practical guidance—without an account, matchmaking, or an internet connection. PLAY AND IMPROVE OFFLINE • Play against Stockfish from Beginner to Expert • Choose White or Black • No account or online opponent required • Practice anywhere, even without an internet connection UNDERSTAND EVERY MOVE After each move, see whether it was a Best Move, Good Move, Inaccuracy, Mistake, or Blunder. Compare your move with the engine’s recommended alternative and identify the moment that changed the game. CLEAR POST-GAME REVIEW Review your game with: • Accuracy • Move count • Mistakes and blunders • The key turning point • The engine’s best alternative LEARN, DON'T JUST PLAY Learning mode includes: • Hints when you are stuck • Take-backs to try another idea • A move list for reviewing positions • PGN export for further study • Opening names for common sequences ON-DEVICE AI COACH On supported devices, AI Coach explains your moves in plain English: • Why a move worked or failed • Which tactical idea you missed • What to focus on next • Themes such as forks, pins, and king safety AI Coach uses Apple’s on-device Foundation Models when available. Move grades and engine recommendations remain available on all supported devices. MADE FOR PRACTICAL CHESS TRAINING Knight & Castle is designed for: • Beginners learning chess fundamentals • Players looking for a strong offline opponent • Chess players studying their mistakes • Anyone who wants private, focused practice The app supports castling, en passant, promotion, checkmate, stalemate, and the 50-move rule. It includes legal-move highlights, check indicators, smooth animations, optional board coordinates, and iPhone and iPad support. No account is required. Games and analysis stay on your device. This app contains ads. Knight & Castle includes the open-source Stockfish chess engine under the GPLv3 license.